Acquisitions and Dispositions - Disposition (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		12 Months Ended
	Aug. 28, 2017	Jun. 21, 2017	Dec. 30, 2016	Jun. 01, 2015	Dec. 26, 2015	Jun. 27, 2015	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (loss) income					$ (8,100)		$ (4,153)	$ 3,720
Gain (Loss) on Disposition of Business							1,491	0	$ 15,376
Proceeds from sale of assets, net of cash transferred							31,564	10,304	5,538
Mueller-Xingrong [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity method investment, ownership percentage		50.50%
Net sales of equity method investment							67,300	121,500	155,900
Net (loss) income							(9)	$ 62	$ 555
DWV Ontario Manufacturing Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lease-back term				22 months
Total sales price of property				$ 20,200
Proceeds from sale of assets, net of cash transferred	$ 10,200		$ 5,000	5,000
Gain on sale of manufacturing assets						$ 15,400
Amount of diluted share after tax (in dollars per share)						$ 0.17
Carrying value of assets disposed				2,300
Goodwill allocated to disposal group				$ 2,400
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Mueller-Xingrong [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of interest		$ 18,300
Assets		56,800
Carrying value of the liabilities disposed		36,200
Cumulative translation loss		$ 3,800
Gain (Loss) on Disposition of Business							$ 1,500